2011- 10- 11
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أكـاديـمـي
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Physics
السلام عليكم ..
عندي homework للفيزياء ومو عارفه كيف احله 
انا حليت الاختيار باقي 5 اسأله احترت فيها .gif "(177)")
فياليت الي عندها الحل تساعدني فيه ابي اجيب العلامه الكلمله 
هذا هي الأساله
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Q.3 In order to slide a heavy cabinet across the floor at constant speed, you exert
horizontal force of 80N. Is the force of friction between the cabinet and the floor
greater than, less than, or equal to 90N? Defend your answer?
Q.4 Find the net force produced by a 80N force and a 20N force in each of the following cases:
a) Both forces act in the same direction.
b) The two act in opposite direction.
Q.5 A net force of 15 N is exerted on an encyclopaedia to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the encyclopaedia
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